Ok, it seems this happens randomly. Here is from today:
[root@helios]~ #uname -r && free -m
[pts/6 # 597H 0J 0R # 2012-07-10 17:42:40 # 0+05:00:38 # 0.77 0.82 0.69]
3.2.0-26-generic
total used free shared buffers cached
Mem: 24110 3930 20180 0 204 1521
-/+ buffers/cache: 2204 21906
Swap: 0 0 0
And now, curiously, the dmi output is different:
[chrivers@helios]~ #sudo dmidecode | grep -E '^\sSize: '
Size: 4096 MB
Size: 4096 MB
Size: 4096 MB
Size: 4096 MB
Size: 4096 MB
Size: 4096 MB
Come to think of it, this morning I first booted into windows, then
shortly afterwards rebooted (but with no power-off in between) into
Linux. Could Windows be affecting this somehow? I have not established a
pattern yet, but I can't rule out that booting into windows makes the
last 2 blocks of RAM appear to Linux. Weird.
Any ideas for debugging this further?
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https://bugs.launchpad.net/bugs/1021289
Title:
Linux 3.2.0-26-generic (Ubuntu 12.04) does not last 8GB of memory
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